104 MR. P. W. BASSETT-SMITH OlST [Feb. 3, 4. On new Parasitic Copepoda from Zanzibar and East Africa, collected by Mr. Cyril Crossland, B.A., B.Sc. By Staff-Surgeon P. W. Bassett-Smith, R.N., F.Z.S. [Received December 4, 1902.] (Text-figures 11 & 12.) Mr. Cyril Crossland, in his recent examination of the marine fauna of Zanzibar and British East Afi'ica, obtained several specimens of parasitic and semiparasitic Copepods, three of which he has been kind enough to allow me to examine. These curiously deformed and often grotesquely-shaped animals are frequently found attached to the gills, &e., or to the surface of fish and other marine animals. A large number from the former which ai-e now described from a variety of different hosts, and from wide geographical areas, I enumerated in Proc. Zool. Soc. 1899, p. 438 ; to this paper I have appended a list of addenda, which I have drawn up with the kind assistance of Mr. E. Bergrotti, of Tammerfers, and others. Not only fish bvxt a number of other marine animals are un-doubtedly infested with these parasites, though at present little information concerning them has been collected ; the specimens of Mr. Crossland are therefore particularly interesting. Gerstacker, in Bronn's ' KJass. unci Ordn. des Thier-Reich s,' 1866-79, Crustacea, vol. v. Copepoda, p. 774, mentions five genera found on Nudi branch Mollusca : Doridicola Lyd., Eolidicola Sars, belonging to the family Ergasilidae ; Ai-totrogus Boeck, to the family Ascomyzontidse ; and Siolanchnoiroinis Hanc. and Ismailia Bergh, to the family Chrondi'acanthidas. Also nine genera fi'om various Vermes, p. 773. Of the three specimens of Mr. Crossland, two were taken from the kidneys of species of Pleurobranchids (not determined) and one from the skin of a Sipunculid (^Aspidosiphon). As they were only single specimens it was impossible to dissect them, and therefore the descriptions are necessarily incomplete. The first two evidently belong to the family Chondracanthidre, but do not fall in with the descriptions of any known genus ; they appear to be most nearly related to the genvis Splanchnotropus of Hancock (Trans. Linn. Soc. vol. xxiv. pp. 51, 55), two species of Avhich he describes, *S'. gracilis and S. brevipes, taken from Nudi-branchs ; the present specimens differ from them, however, in the complete absence of antennae and articulate limbs, and in having the external ovaries elongated and the eggs arranged in single series. I have therefore provisionally placed them in a new genus, Cho7ulroca7-pus, following closely after S2^lconchnotro2n(,s Hanc. and IHocus Fabr. Chondrocarpus, gen. nov. $ . Cephalothorax coriaceous, elongated, with four lateral short
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